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      Senior Backend Engineer Interview

      Feb 9, 2026
      Anonymous employee
      Accepted offer
      Positive experience
      Average interview

      Application

      I applied through a recruiter. The process took 2 weeks. I interviewed at Trustly in Jan 2026

      Interview

      O processo transcorreu muito bem e de forma muito ágil. Foram duas semanas entre o primeiro contato com a recrutadora e a oferta. As etapas do processo foram: entrevista inicial com a recrutadora, assessment de inglês, entrevista técnica (sem live coding, apenas um system design em alto nível, sendo opcional o uso de ferramentas e compartilhamento de tela), entrevista com o gestor da squad, uma última entrevista com o gestor de QA e a PM, e por último, foi solicitado o envio de três referências profissionais.

      Interview questions [3]

      Question 1

      Entrevista técnica: Quais as diferenças entre HashMap, TreeMap e LinkedHashMap? E porque eu escolheria um ao invés de outro?
      Answer question

      Question 2

      Entrevista com gestor: O que eu mudaria no meu fluxo de trabalho atual?
      Answer question

      Question 3

      Entrevista com QA e PM: Num cenário com um bug que afeta 1% da base de usuários e um gargalo de performance que afeta 100% dos usuários, qual eu priorizaria?
      Answer question

      Other Senior Backend Engineer Interview Reviews for Trustly

      Senior Backend Engineer Interview

      May 28, 2026
      Anonymous employee
      Accepted offer
      Positive experience
      Difficult interview

      Application

      I applied online. I interviewed at Trustly in May 2026

      Interview

      The process took approximately 4 weeks and had 5 stages. It started with an HR screening: I was contacted via email and had the interview scheduled within a few days. The conversation was straightforward: background, motivation, and general culture fit. Nothing unexpected. From there, I moved into the technical interview, which was the most substantial stage. It was structured in clearly defined blocks, covering OOP and SOLID principles, Java internals, a SQL code review, a Java code review, and a system design challenge. Each block flowed naturally into the next, and the interviewer was genuinely engaged. It felt more like a technical discussion than an interrogation. The hiring manager interview came shortly after. It had a mix of architectural and behavioral questions, going deeper into how I applied concepts in practice rather than just whether I knew them in theory. The final stages were a background check and professional references submission, both handled smoothly and without unnecessary back-and-forth. Overall, the pace between stages was consistent. There were no long unexplained gaps, and communication throughout was clear.

      Interview questions [5]

      Question 1

      Can you give a practical example of the Dependency Inversion Principle?
      Answer question

      Question 2

      What is the difference between an abstract class and an interface, and when would you use each?
      Answer question

      Question 3

      When would you favor composition over inheritance?
      Answer question

      Question 4

      What is the difference between Minor GC and Major GC?
      Answer question

      Question 5

      How do you apply the testing pyramid in your projects?
      Answer question